Infinitely many zero-Pisano-Legendre primes conjecture

Let aa and bb be integers with (a,b)(0,0)(a,b)\neq(0,0). Let χ(a,b)\chi(a,b) be the set of admissible indices, and for kχ(a,b)k\in\chi(a,b) define

ϑ(a,b)(k)={p:p is a k-Pisano-Legendre prime relative to (a,b)}.\vartheta_{(a,b)}(k)=\{p:p\text{ is a }k\text{-Pisano-Legendre prime relative to }(a,b)\}.

Infinitely many zero-Pisano-Legendre primes conjecture. If 0χ(a,b)0\in\chi(a,b), then

ϑ(a,b)(0)=0.|\vartheta_{(a,b)}(0)|=\aleph_0.

The claim predicts infinitely many zero-Pisano-Legendre primes whenever zero is an admissible index. The source presents increasing numerical counts as motivation, but gives no proof or resolution.

Sources & referencesView supporting material

Primary source

J. D. Andoyo, “(a,b)-Fibonacci-Legendre Cordial Graphs and k-Pisano-Legendre Primes”, arXiv:2601.10561 (2026).

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